Masato (中井正人) Nakai
ID 1154985
Born : 1980 Cat. M45 Ultrarunner since 2018 JPN
7
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
25
DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details
1
Countries visited ?JPNJapan
11,4%
Rank quotient ?This runner's calculation uses 7 eligible race(s): Σ(rank − 1) = 1 298; Σ finishers = 11 386. 1 298 / 11 386 × 100 = 11.40%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed7
Km — ultra races700 km
Longest race100,0 km
41. Lake Saroma 100 km Ultramarathon — 28/6/2026

Km per year (ultra races)

100
1 race
2022
200
2 races
2023
100
1 race
2024
100
1 race
2025
100
1 race
2026

Race types (share of distance)

Road71,4%
Ult.Walk28,6%

Records

100 km8h14'04

HISTORY

7 race(s)
DateRacePerf.Rk
2026
28.06 100km JPN41. Lake Saroma 100 km Ultramarathon 9:28:57 h328
2025
29.06 100km JPN40. Lake Saroma 100 km Ultramarathon 8:14:04 h50
2024
30.06 100km JPN39. Lake Saroma 100 km Ultramarathon 8:40:06 h65
2023
14.10 100km JPN9th Lake Biwa Charity 100km Walking Tournament 19:47:28 h60
25.06 100km JPN38. Lake Saroma 100 km Ultramarathon 9:41:30 h216
2022
15.10 100km JPN8th Lake Biwa Charity 100km Walking Tournament 22:28:44 h47
2018
24.06 100km JPN33. Lake Saroma 100 km Ultramarathon 10:19:44 h539